
24 Dräger X-am 2500
Operation
Allowed test gas concentration:
1. Connect the test gas cylinder with the calibration cradle.
2. Vent the test gas into a fume cupboard or into the open air (with a
hose connected to the second connector of the calibration cradle).
3. Switch on the instrument and insert it into the calibration cradle.
4. Press the [+]-key and keep it pressed for 5 seconds to open the
calibration menu, enter the password (password on delivery = 001).
5. Use the [+]-key to select the single gas calibration function.
The symbol for span calibration flashes.
6. Press the OK-key to start the channel selection.
The display flashes the gas of the first measuring channel,
e. g. ch4 - %LEL.
7. Press the OK-key to start the calibration function of this measuring
channel, or use the [+]-key to select another measuring channel
(O2- vol. %, H2S - ppm or CO - ppm, etc.).
The calibration gas concentration is displayed.
8. Press the OK-key to confirm the calibration gas concentration or
use the [+]-key to change the calibration gas concentration and
complete the process by pressing the OK-key.
The measurement value flashes.
9. Open the test gas cylinder valve to let gas flow over the sensor
with a volume flow of 0.5 l/min.
The displayed, flashing measurement value changes to the value
according to the supplied test gas.
When the displayed measurement value is stable (after at least
120 seconds):
a. Press the OK-key to carry out the calibration.
The display containing the current gas concentration changes
with the display OK.
b. Press the OK-key or wait for approx. 5 seconds to end the
calibration/adjustment of this measuring channel.
Potentially, the next measuring channel will be offered for
calibration.
After the calibration/adjustment of the last measuring channel,
the instrument changes to the measuring mode.
c. Close the test gas cylinder valve and remove the instrument
from the calibration cradle.
If a fault occurred during the span calibration/adjustment:
zThe fault message appears and is displayed for the
respective sensor instead of the measured value.
zIn this case, repeat the calibration/adjustment.
zIf necessary, change the sensor.
Notice for the adjustment of the ex-channel to nonane as
a measuring gas:
zDuring the calibration of the ex-channel, propane can be used as
a substitute calibration gas.
zWhen using propane to adjust the ex-channel to nonane,
the display must be set to twice the used test gas concentration.
Notice for the use in subsurface mining:
zFor the adjustment of the ex-channel to the measuring gas
methane, the display of the instrument must be set to a value of
5 % (relative) higher than the test gas concentration used.
Ex: 40 to 100 %LEL
O210 to 25 vol. %
CO: 20 to 999 ppm
H2S:5 to 99 ppm
Test gas concentrations of other gases: see Instructions for Use of
the respective DrägerSensors.
CAUTION
Never inhale the test gas. Health hazard!
Observe the hazard warnings of the relevant Safety Data
Sheets.